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KVM: arm64: Move vcpu SVE/SME flags to the state flag set 

The two HOST_{SVE,SME}_ENABLED are only used for the host kernel
to track its own state across a vcpu run so that it can be fully
restored.

Move these flags to the so called state set.

Reviewed-by: Fuad Tabba <tabba@google.com>
Reviewed-by: Reiji Watanabe <reijiw@google.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
This commit is contained in:
Marc Zyngier 2022-05-28 12:38:20 +01:00
parent b1da49088a
commit 0affa37fcd
2 changed files with 11 additions and 9 deletions
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8
arch/arm64/include/asm/kvm_host.h
View File

@ -515,6 +515,11 @@ struct kvm_vcpu_arch {
/* Save TRBE context if active */
#define DEBUG_STATE_SAVE_TRBE __vcpu_single_flag(iflags, BIT(6))
/* SVE enabled for host EL0 */
#define HOST_SVE_ENABLED __vcpu_single_flag(sflags, BIT(0))
/* SME enabled for EL0 */
#define HOST_SME_ENABLED __vcpu_single_flag(sflags, BIT(1))
/* Pointer to the vcpu's SVE FFR for sve_{save,load}_state() */
#define vcpu_sve_pffr(vcpu) (kern_hyp_va((vcpu)->arch.sve_state) + \
sve_ffr_offset((vcpu)->arch.sve_max_vl))
@ -536,11 +541,8 @@ struct kvm_vcpu_arch {
})
/* vcpu_arch flags field values: */
#define KVM_ARM64_HOST_SVE_ENABLED (1 << 4) /* SVE enabled for EL0 */
#define KVM_ARM64_ON_UNSUPPORTED_CPU (1 << 15) /* Physical CPU not in supported_cpus */
#define KVM_ARM64_HOST_SME_ENABLED (1 << 16) /* SME enabled for EL0 */
#define KVM_ARM64_WFIT (1 << 17) /* WFIT instruction trapped */
#define KVM_GUESTDBG_VALID_MASK (KVM_GUESTDBG_ENABLE | \
KVM_GUESTDBG_USE_SW_BP | \
KVM_GUESTDBG_USE_HW | \

12
arch/arm64/kvm/fpsimd.c
View File

@ -79,9 +79,9 @@ void kvm_arch_vcpu_load_fp(struct kvm_vcpu *vcpu)
vcpu->arch.fp_state = FP_STATE_HOST_OWNED;
vcpu->arch.flags &= ~KVM_ARM64_HOST_SVE_ENABLED;
vcpu_clear_flag(vcpu, HOST_SVE_ENABLED);
if (read_sysreg(cpacr_el1) & CPACR_EL1_ZEN_EL0EN)
vcpu->arch.flags |= KVM_ARM64_HOST_SVE_ENABLED;
vcpu_set_flag(vcpu, HOST_SVE_ENABLED);
/*
* We don't currently support SME guests but if we leave
@ -93,9 +93,9 @@ void kvm_arch_vcpu_load_fp(struct kvm_vcpu *vcpu)
* operations. Do this for ZA as well for now for simplicity.
*/
if (system_supports_sme()) {
vcpu->arch.flags &= ~KVM_ARM64_HOST_SME_ENABLED;
vcpu_clear_flag(vcpu, HOST_SME_ENABLED);
if (read_sysreg(cpacr_el1) & CPACR_EL1_SMEN_EL0EN)
vcpu->arch.flags |= KVM_ARM64_HOST_SME_ENABLED;
vcpu_set_flag(vcpu, HOST_SME_ENABLED);
if (read_sysreg_s(SYS_SVCR) & (SVCR_SM_MASK | SVCR_ZA_MASK)) {
vcpu->arch.fp_state = FP_STATE_FREE;
@ -164,7 +164,7 @@ void kvm_arch_vcpu_put_fp(struct kvm_vcpu *vcpu)
*/
if (has_vhe() && system_supports_sme()) {
/* Also restore EL0 state seen on entry */
if (vcpu->arch.flags & KVM_ARM64_HOST_SME_ENABLED)
if (vcpu_get_flag(vcpu, HOST_SME_ENABLED))
sysreg_clear_set(CPACR_EL1, 0,
CPACR_EL1_SMEN_EL0EN |
CPACR_EL1_SMEN_EL1EN);
@ -193,7 +193,7 @@ void kvm_arch_vcpu_put_fp(struct kvm_vcpu *vcpu)
* for EL0. To avoid spurious traps, restore the trap state
* seen by kvm_arch_vcpu_load_fp():
*/
if (vcpu->arch.flags & KVM_ARM64_HOST_SVE_ENABLED)
if (vcpu_get_flag(vcpu, HOST_SVE_ENABLED))
sysreg_clear_set(CPACR_EL1, 0, CPACR_EL1_ZEN_EL0EN);
else
sysreg_clear_set(CPACR_EL1, CPACR_EL1_ZEN_EL0EN, 0);